temperature analysis of mass grout pours for single shell ......the temperature rise in the grout...
TRANSCRIPT
Temperature Analysis of Mass Grout
Pours for Single Shell Tank Closure Raul Dominguez (DOE Fellow, Florida International University),
Colin Henderson, M.S., P.E. (Mentor, Columbia Energy & Environmental Services, Inc.),
Brian Rumburg, Ph.D. (Columbia Energy & Environmental Services, Inc.)
Special Acknowledgement to: Leonel L. Lagos, Ph.D., PMP ®
INTRODUCTION: Operations at the Hanford site have left 55 million
gallons of mixed waste stored in 177 underground
tanks, 149 of them being single shell tanks (SST).
These SSTs were built between 1943 and 1964
(Roelant, 2007). Due to mechanical weathering
and extended use, some tanks have leaked. Plans
for tank closure are underway, involving the
removal and treatment of waste followed by
stabilization of the tank structures.
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70
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90
100
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120
130
0 50 100 150 200 250 300 350
Tem
pera
ture
(°F
)
Time (1/2 hrs)
6ft dia. Cylinder Experimental Results vs. ConcreteWorks Theoretical 6x6x6 ft Footing
Exp. 2ftExp. 4ftCross Section 2ftCross Section 4ft
References: 1) Roelant, D., McDaniel, D., Awwad, A., Varona, J., 2007. “Remote Automated Monitoring Systems for High Level Radioactive Waste”. Applied Research Center; 2) Gajda, J., Alsamsam, E., 2006. “Engineering Mass Concrete Structures”. Professional Development Series. Portland Cement
Association.; 3) Gajda, J., Vangeem, M., 2002. “Controlling Temperatures in Mass Concrete”, Concrete International.59-62; 4) Riding, K.A., Poole, J.L., Schindler, A.K., Juenger, M.C.G., Folliard, K.J. 2006.”Evaluation of Temperature Prediction Methods for Mass Concrete Members” ACI Materials Journal 357-365; 5)
Henderson, C., “Closure Demonstration Grout Test report” 2009. Columbia Energy & Environmental Services, Inc. RPP-RPT-41550, Rev. B; 6) Riding, K.A., Poole, J.L., Schindler, A.K., Juenger, M.C.G., Folliard, K.J. 2006.”Evaluation of Temperature Prediction Methods for Mass Concrete Members” ACI Materials
Journal 357-365; 7) Incropera, F.P., and D.P. DeWitt. Introduction to Heat Transfer. 3rd ed. United States of America: John Wiley & Sons, Inc, 1996. Print. Kyle A. Riding Evaluation of Temperature Prediction Methods for Mass Concrete Members
OBJECTIVE: The objective of this investigation
is to determine if the maximum
temperature expected during tank
closure using the bulk fill grout
formulation will be below levels of
concern, thereby reducing or
eliminating operational constraints associated with
the temperature rise in the grout pour.
Lift
Height(ft)
Max Temp
Recorded
(°F)
Max Temp
Difference
(°F)
15 123 44
20 125 47
50 126 49
SELECTION OF METHOD: A diligent search was conducted
for an efficient method or tool
that can be used to predict grout
curing temperatures.
ConcreteWorks V2 proved to be
the best accessible tool. Its
versatile mixture proportions and easy-to-use
graphical user interface allowed us to input our
specific recipes. ConcreteWorks also allows us to
input weather data and duration of analysis.
Results:
RESEARCH DESCRIPTION: Elevated temperatures during curing can cause
an increase in porosity and a decrease in
compressive strength (Gajda, 2006). There are
standard maximum temperatures for concrete
but none for grout. A software package called
ConcreteWorks V2 was used to predict
temperature values over a 14 day period.
CONCLUSION: Based on evaluation, the rectangular footing best represented
the tank closure situation, and the maximum temperatures
predicted were less than 130 °F. Due to the small amount of
cement contained in the grout formulation designed for use
during bulk filling of the tanks, elevated temperatures will
typically not exceed levels of concern. Maximum temperature
values plateauing, prove that grout lift height will not be a
concern or limitation.
Data above demonstrates deviations between
theoretical cross sections and experimental values.
•Three models were
processed to determine
grout lift heights 50ft,
20ft and 15ft.
•Maximum temperatures
did not exceed 130 °F.
•Only the 15ft model
demonstrated a
maximum temperature.
•The other two models
kept same temperature
for days.